Volatile component analysis combined with stir bar sorptive
extraction In this work, we applied the stir bar sorptive extraction (SBSE)
method to analyze the volatile components. SBSE, which uses a stir bar coated with
poly(dimethylsiloxane) (PDMS), has been widely used for its versatility and sensitivity
(20). 10 mL of sake sample which was adjusted to a 10% (v/v) ethanol
concentration with pure water was dispensed into a 10 mL glass headspace vial.
2 g of NaCl was added and 3-octanol was added up to 0.5 mg/L as an internal
standard. Then, a stir bar (Twister from Gerstel, Mulheim an der Ruhr, Germany,
10 mm length, 0.5 mm layer) was placed in and the mixture was stirred at room
temperature (24C), 125 g for 1 h. Stir bar was then removed from the sample,
dried with a lint-free tissue, and transferred to a glass thermal desorption tube for
GC/MS analysis.